One finds that inventors in many countries have reached the same goals, working almost completely without each others' achievements. All contributed valuable ideas in this life-saving evolution, although very few built respirators there were widely used. Complete success was difficult, requiring mechanical ability, knowledge of physiology, attention to nursing care, widespread demand (as in an epidemic) and adequate finances. The evolution pictured here has not ended, but wonderful machines now exist, and thousands of lives have been saved.

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